Tower sub-structure support



FIG. 1 is a rear perspective view of a tower sub-structure supportillustrating the new design;

FIG. 2 is a bottom view of the tower sub-structure support illustratedin FIG. 1;

FIG. 3 is a top view of the tower sub-structure support illustrated inFIG. 1;

FIG. 4 is a front view of the tower sub-structure support illustrated inFIG. 1;

FIG. 5 is a rear view of the tower sub-structure support illustrated inFIG. 1;

FIG. 6 is a rear view detail (top portion) of the tower sub-structuresupport illustrated in FIG. 5;

FIG. 7 is a rear view detail (bottom portion) of the tower sub-structuresupport illustrated in FIG. 5;

FIG. 8 is a left side elevational view of the tower sub-structuresupport illustrated in FIG. 1; and,

FIG. 9 is a right side elevational view of the tower sub-structuresupport illustrated in FIG. 1.

The dashed lines are included for the purpose of illustration andenvironment only and do not form a part of the claimed design.

CLAIM We claim the ornamental design for a tower sub-structure support, as shown and described. 